i was wondering how car can the wire be from the lm317t to the LEDs ... i remember reading somewhere it said it can't go too far from the regulator to the LED's itself

if you guys can give me examples of what you've done before like 3ft, 5ft or 10ft ... thanks

 

That depends on the current you supply to the LEDs and the gauge of the wire. Generally you want to minimize R.I^2 losses.

 

If you are using long wires remember to the 330nF and 100nF on the input and output of the regulator respectively to avoid any oscillations.

 

As MIK3 said, it is the oscillations that are the reason. The caps should address that nicely, so I wouldn't worry about it.

 

Ya its there in the data sheet itself... adding caps for longer lengths of wire from filter..

 

sorry about not leaving the 411 ...

its going to be on my car .. so about 12v .... with a 22gauge wire ... 3v, 100ma to the leds

 

22gage wire will offer .016 Ohms per foot. That's per lead, of course. So a hundred feet with two conductors will total 3 Ohms or so.